Add a skybox to the visualization project.

...va/fr/amap/lidar/amapvox/visualization/Visualization.java

...amapvox/visualization/controllers/loadables/Loadable.java

...visualization/controllers/loadables/meshes/base/Face.java

...visualization/controllers/loadables/meshes/base/Mesh.java

...lization/controllers/loadables/meshes/base/Primitive.java

...sualization/controllers/loadables/meshes/base/Vertex.java

...ization/controllers/loadables/meshes/base/VertexList.java

.../controllers/loadables/meshes/extended/CubePrimitive.java

...lization/controllers/loadables/meshes/faces/FaceList.java

...lization/controllers/loadables/meshes/faces/LineFace.java

...ization/controllers/loadables/meshes/faces/PointFace.java

...lization/controllers/loadables/meshes/faces/QuadFace.java

...tion/controllers/loadables/meshes/faces/TriangleFace.java

...ization/controllers/loadables/programs/BorderProgram.java

...visualization/controllers/loadables/programs/Program.java

...ization/controllers/loadables/programs/SimpleProgram.java

...ization/controllers/loadables/programs/SkyboxProgram.java

...lization/controllers/loadables/programs/VoxelProgram.java

...x/visualization/controllers/loadables/shaders/Shader.java

...alization/controllers/loadables/shaders/SkyboxShader.java